Just because their family member is hostage is no reason or right to expect a White House invite.
The 911 families were kept at arm’s length for years because the US wanted to keep good relations with the Saudis. Biden could use an invite as a signal that he favors Israel in the current war, but that would antagonize the leftoids in his party.
Well, if it was your son or daughter….an invitation to the WH for a Jewish celebration just MIGHT show the terrorists that the POTUS knows the names and faces of the missing and their families
And you might hold a little bit of hope it would influence their release