I'm typing this on Father's Day though it won't post until the day after, but I wanted to write something Father-ish.
This can actually help your characters. I'll liken this to when I used to date. I always paid attention to how my dates would treat their parents and other family members. I would be leery of dates that treated their parents or siblings with disdain and disrespect. Why? Because if your date treats their loved ones like this then imagine how this person will treat you once the "honeymoon period" is over. I liked dates who were respectful to their family; I bailed on the ones who didn't.
I'm not saying your main characters have to hero-worship their parents. But if your character treats their parents with respect, even if he or she doesn't agree with what is being said, then it will go a long way towards building likability in your character. Having parents and a family is a good way to get to know and eventually root for your character. You can use the interactions with the MC's family members to really learn who your characters are and is a great way to show and not tell a character's personality.
One example is Marty McFly from the Back to the Future franchise. Even when his parents were losers and pushovers he still treated them with respect. Of course, having parents were a major part of the plot, but in trying to save their love it helped you root and cheer for him hoping that George would kiss Lorraine at the Fish Under the Sea Dance (no, no, it was the Enchantment Under the Sea Dance).