One thing you CAN do OIN is buy some flowers on each visit and leave them there with a card indicating you were the one dropping them off... even if she's sleeping, put flowers there with a card.
This is an excellent chance for you to show BOTH of them at the same time how supportive, open hearted, and generous you can be when it is really needed... this is a really great chance to give your wife and FIL some reassurance that you are a decent guy now...
I would visit every day and leave flowers every day.
