Here is a new idea for the Family tab. Each household (parents and their unmarried children) gets its own group, linked to the parents' families. You see every family that shares a parent or grandparent with yours, so brothers, sisters, aunts, uncles and cousins all show up, but not your brother's or sister's in-laws.
These three prototypes are different ways to get around all those families. They use a made-up family. The dark bar at the bottom lets you switch whose phone you are looking at. Please try each one, then rate it and leave a comment.