I saw this film on TV (channel 5 in the UK) in the late nineties, and I’m pretty sure it was part of a trilogy. One of the early scenes shows a young woman travelling home from the convent where she worked on the bus; it later transpires that she’s pregnant. One of her brothers gets divorced and also ends up back home, and there’s another sister and, I think, another brother in the film too. Another scene I remember is when the sisters get into a fight with someone in a bar.
The film’s a comedy drama and whenever I mention it to anyone, no-one seems to have heard of it!