Can two family members share an apple account?

Technically, yes. In practice, not without problems.

Sharing? Only if you want trouble, weirdness, hassles, and grief, as the notifications, calls, messages, and such are routed seemingly unexpectedly—what would be correctly displayed for one user, but is incorrect and confusing when two or more people sharing the Apple ID.

The approach Apple prefers and recommends here is unique Apple IDs per person, and setting up Family Sharing.