I like it when the characters have many facets. That's surely what we mean when we say we want character-led storylines?
Take just Susan, for example. (It does help, of course, that Susan is one of the best acted characters, and has never been re-cast.)
Susan is a loving wife in a long-lasting marriage. It was a shotgun marriage but it's worked. Her husband Neil stood by her when she went to prison for sheltering her jailbird brother, who'd threatened to harm her children if she didn't help him. They've moved well beyond that now.
Susan wanted a lot from life. She tried to push Neil towards a sales job and a lifestyle that raised their income and social status but he was unhappy. When he finally said no, that wasn't what he wanted, she wasn't happy but came to terms with it. The compensations came eventually when they built their own home and Neil got a management job that he felt comfortable with.
Susan didn't come from a family where education was a priority or expectations for her career were high. She has made the best of the hand she was dealt and has secure, skilled jobs at the Village Shop and Bridge Farm. She could have made a lot more of herself if she'd gone back into education, but she prioritised other things.
Susan is the village gossip but has no self-awareness about this and frequently tells people their secrets are safe with her. She has a lot of involvement in village life, not always in a positive way, but she does have friends as well as family. She likes a drink at times and we know she's a good cook and has an active sex life with Neil.
Susan is a devoted daughter, sister, mother and grandmother whose daughter is turning out very like her. She's very close to her birth family in spite of their many faults, to which she isn't blind. She remains on good terms with all of them except probably Clive, and is especially close to her sister and her sister's children.
Susan is a mother-in-law whose daughter-in-law comes from a very different background, not just socially, but educationally. She has managed to be very restrained about not pressuring Chris and Alice to have children, possibly because she knows how her own life has been totally dominated by the pressure of family responsibilities.
I could have done something similar to this for Joe. It's always best when there's a lot of conflicting stuff about a character.