A family member has form for flaking on plans at the last minute, being very late or just forgetting altogether.
Yesterday, said family member rang me and made a provisional arrangement to come round today... she was going to call me at a certain time today and say if she was coming as she had a plan in the morning. Fair enough.
BUT because of how unreliable she can be, I stated that this was fine, but please make sure you let me know if you're coming either way so I can go do other things if you're not.
That time has been and gone, a couple of hours ago. I've sent a message at 3pm saying if you need to cancel it's fine, but please let me know. No reply.
Would I be rude to just go out?