It is definitely not a Polaroid camera, as the typical white border is missing.
1) But it's also probably Royce's house. On the Jill date, the MC was there. If the mothers know each other, the fathers automatically know each other. Then the dads only introduced Bianca and Jill to each other because the moms were busy buying hot lingerie.
2) Read my post again properly. Nowhere in this thread did I write that Amelia and Lynette are friends.
Where does it say that Lana is Amelia's daughter? Since Lana and Amelia are almost the same age, that's actually biologically unlikely. Ergo, Lana is probably Jill's half-sister. And thus your milkmaid calculation no longer fits.
I go by your assumption that Jill was 10 years old in retrospect. So Tremolo was already born and about 8 years old. Let's assume that Amelia gave birth to Jill at the age of 19. Then Amelia would have been 21 years old when Lynette gave birth to Tremolo at 19.
The deciding factor in all these births is the fathers. Neil is 6 years older than Lynette. Who knows how much fun Neil had. Maybe he also needed money and donated his sperm?
But we don't know how old Jill's father is. What if he is 6 years older or much older than Amelia? Has he been married before. Amelia would not be the first stepmother in BaDIK either.
3) As for the name Marion, I have thought like you before. However, that was quite a while ago. A holy thread participant pointed out to me that Marion is also a term for a nice older woman in English. In fact, I think it's likely because Karen is a meme term. Maya called Derek that in a cackle from EP8.