Learn one song well enough to play at a family gathering. Someday someone will ask for it at a wedding or a memorial.

One song you can play reliably is worth more than a dozen you half know. Families run on occasions, and occasions need somebody who can do the thing without a music stand: a birthday, a wedding, a room that needs filling after hard news. The skill is small and the role it gives you is not. You become the person who can be asked.

Choose one song and get it to the point where nerves cannot take it from you. Play it badly in front of your family a few times on purpose. That is the practice that matters, and a few months of it is enough.