It doesn't seem like Claire (Phil's mom), and Dory (Jason's mom) have menus to choose the scenes like Lizzy (Charles' sister) does (although her's is bugged and doesn't work properly anyway).
So here's a little walkthrough for Claire (Phil's mom) that will eliminate most of the grind, and allow you to view all her scenes:
Phil's relationship variable is #25. After you trigger it at recess the first time, you can change it to 15 (variable #25 = 15) to trigger Phil's quest.
After you get all the insects for Phil (there are numerous post in this thread explaining where they are, and how to catch them), you can visit Phil at his home (Building #2 in the New Neighborhood).
Here are the options when hanging out with the guys, and the increase they "normally" have on there relationship variable:
Talking = +5
Playing video games = +10
Watching porn on the internet = +10
After the 3rd visit (or when variable #25 = 50), you can talk to Phil's mom (Claire) in the kitchen for the first time. She will ask you to give Phil a chance, and try to become his friend, etc.
After you talk to her, the very next time you visit Phil, two things will happen:
1) His relationship variable (variable #25) will only increases by 5 no matter which option you choose
2) Variable #139 is triggered
Variable #139 is the counter for the number of days that pass without visiting Phil
When variable #139 = 5, Phil’s mom will appear outside the school after school lets out
Talk to her
The very next time you visit Phil, before you leave talk to Claire (at night) in the kitchen
You will ask her to see her tits, and this will also trigger her love variable (variable #138)
Once variable #138 is triggered, it increases by 1 every time you interact with Claire after visiting Phil
To view any of her scenes you can change variable #138 as follows:
1-4, she shows you her tits
5-8, she shows you her ass
9-11, she lets you touch her tits
12-14, she shows you her pussy
15, she lets you jack off to her (no cum)
16, she lets you eat her out
17-19, she lets you fuck her tits
20-24, she gives you a blowjob
25-26, interactive sex scene (vaginal, missionary)
27-30, interactive sex scene (vaginal, reverse cowgirl)
31-34, interactive sex scene (anal, standing doggystyle)
35+, interactive sex scene (anal, piledriver)