If you go back through Rick substantial time line you notice that there's barely any pictures of him with Niki's family at all, and there was that one holiday card he was in, but they cut off everything but his fat elbow and a piece of his arm. If they don't invite him to family gatherings and holidays they're not gonna let him live with them, Niki probably, but Rick's gonna be out on the street.
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Notice how he's not as fat there so that was a long time ago, they grew to hate his fat lazy ass and we all know why. You cut someone out of a picture like this that's a statement, you cut them out when there's also plenty of space on the other side that's empty and could be cut instead that's twisting the knife, that's the kill shot, that's telling them to fuck off.