So sorry to hear about BOTH your babies
I would keep in close contact with your vet and when they think it's time I'd let him go..as hard as that is. You don't want him to suffer if it's best to let him go. You'll see both your babies again at the Rainbow Bridge. Just LOVE, CUDDLE, and KISS him as much as you can. Hugs to you and Raven. You're both in my prayers.