I reckon you ring em up? See what's wrong? Unless they spam your phone, is that why you blocked them?We all live close to each other. My brother does have a problem with my sister, whether that extends to her husband I'm not sure. But he sees them a lot less than I do. My other brother is a FIFO worker so don't see much of him.
I think my Mum has a soft spot for my sister, she's her only daughter. I think that extends to her husband and their kids.
My Dad really couldn't give a sh*t and I don't blame him. He is retired and just wants to relax.