When they are in MLC, they become someone very different from the person we knew. The card is a prime example of that. He doesn't want to be reminded of the past and his old life, so he won't sign it the way he normally would. In fact, you may notice this more often as time rolls along. It's nothing personal towards you or your family...it's just him and how he's dealing w/himself.
BTW, at least he sent a card...many of them don't.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
