In general, if I let my imagination run wild - I'd like to see the following:
Mert Sr. has two daughters - Linda (pregnant) and Leila (aka Barbara, aka Bubbles).
If you follow my version, she has an 18 year old daughter. Since mom has been building her business, the girl has grown up quite willful. Her demeanor is pretty loose, though in appearance and mannerisms she should resemble more of a Linda. Perhaps a couple of small tattoos (No more!).
There's also a daughter-in-law and granddaughter, also 18 years old. This girl should be different from the other Mert descendants: The most modest, similar to Kay. The wayward son doesn't live with them, regularly disappearing somewhere.
So Linda saw the note on the floor, and the father told her his story. And that he'd like to introduce and reconcile everyone. Linda agrees to help and is ready to go to the island again, as she realizes from her experience that the environment there is more conducive to rapprochement. She notes to herself that she understands her father and is ready to indulge his possible "pranks".
Mert uses various pretexts to lure Leila and his granddaughter to the island, and his son's wife and another granddaughter. The son, according to his plan, should arrive after some time. The stay on the island should be quite long.
Mert has some suspicions about his daughter-in-law. The fact is that she is the younger sister of his third wife (Linda's mother). When he met his future wife, she was 19 years old and got a job working for him as a secretary on her own, although she was from a family that was quite useful to him at the time. A year later Linda was born to them. He was happy with his new marriage, but he noticed her gold-digging habits. Suspicions were strengthened when 12 years later she introduced her younger (by 10 years) sister to his son (about which, apparently, she found out somehow, although her excuse is that living with such a lover she just had to be insured).
In principle, Linda had seen her "aunt" and cousin (and niece at the same time) several times, but she did not know who they were to her brother, of whose existence she also did not suspect. Her mother didn't broach the subject, and Mert preferred to feign complete ignorance. Either way, Linda's mother does not currently play a role in the narrative.
Since the relationship between father and son was not so simple, wealth is not observed in the family and Mert's daughter-in-law and granddaughter are rather modest people. Therefore, the offer to work at an island resort for good money they meet with joy. Only by a deliberate mistake, instead of a really respectable and widely publicized business, they will have to get to this no less respectable, but still specific private island.
The owner of a small cafe Barbara and her daughter also get to the island in the same way. Mert's granddaughter is involved in a mafia fight (not by accident) and the mother decides to hide with her daughter somewhere far away. And the fact that the boat brings them to the wrong island, they can only be happy, as their tracks are finally confused.
So, Grandpa Mert sits quietly in the bungalow for a while while his daughters work things out.
The difficulty at first is to somehow reconcile the former rivals in the struggle for Mert Junior's hand, and Linda has to make some effort. It begs the question, why are they so much alike with Leila? Time to solve the mystery...
Things work out well: the sister of Mert's wife (40 years old) turns out not to be a bad person at all, and has always had a good attitude towards Leila (Barbara-Bubblies). The women make up quickly.
It must be said that the information that Leila has given birth to a perfectly healthy child (with a high probability from her brother!) received by Linda from her father and supported by a frank conversation with her sister makes Linda very happy and enthusiastic (if earlier she subconsciously considered herself a pervert and a degenerate, now it becomes a norm for her). The sisters visit their father, and after a while the sibling conversations grow into something more!
However, the books on chemistry, which Mert Senior read in his study, are shown not by chance...
The girls are very agreeable and affectionate. In addition, one girl secretly liked the old man a long time ago, so much so that she married his son because he looks so much like him. Naturally, it is necessary to console and this sexually unsatisfied (because of long separations from her husband) milf.
Meanwhile, the granddaughters are devoted to joint sexual liberation. So much so that the most advanced demonstrates a complete lack of squeamishness towards the old grandfather. Naturally, this turns on the modest girl.
In general, when Mert Junior, who has been guided to the true path by specially trained people, arrives on the island, he finds his father on his deathbed, who bequeaths him his entire business (oh, and even this island!), along with four slightly pregnant girls and one who is ready to give birth, which she successfully does by letting her dying grandfather (father) hold the boy in his arms.
After a bit of grieving, the friendly family soon begins to indulge in lovemaking, to which Linda joins after the due date. However, the other three women on the island's staff are not left out. A year later, the population of the island has rapidly increased by about eight newborn girls.
However, sooner or later, everyone returns to civilization, but the story can be continued in 18 years, the return to the island heir accompanied by two aunts and 20 sisters (some, however, will be nieces, but it does not matter). With all the ensuing details.
