Husband in Hospital

I agree with what Alea has said. I hope your husband is well and home soon.

At the risk of causing trouble, why should your son dictate what you or your grandson(I am assuming he is grown up?) do?
Arrange visiting times well apart and tell both of them not to distress grandfather.
Enlist help of ward staff if you want to restrict any visiting if you feel unable to lay down the law yourself, your DH needs rest and no upsets so that he can make a full recovery. Wishing him and you well - you don't need this either, the family should be rallying round you, not adding to your worries.