Tried visitas as I wasa speaking to a single, familiar friend, not formally. THat should've been accepted, right? It wasn't.
Yeah I had the same problem
why isn't vistas accepted
Because you've misspelled it. It should be "visitas".
why "tus" abuelos" & not "sus abuelos"?
tus is informal. so since its visitaS you are speaking informally and therefore need tus and not sus.
Why is "¿Qué días estás visitando a tus abuelos?" not accepted?