Why no 'if these walls could talk' 3 and 4?
The 2 "if these walls could talk" movies dealt with social issues in different eras, mainly abortion and lesbianism. Well how about RACISM. One family could be blacks in the south during Jim Crow another could be Jews experiencing antisemitism and the 3rd could be hispanics being harrassed and maybe the fourth could be middleeastern emigrants after the terrorist attacks.
Then you could do the flipside of the 2nd movie and have a movie about gay MALE couples?