And a few other things- This is the way I see it
Gramps has a wife. They have a son, John.
Gramps has an affair. This produces Logan. Note that Logan and Gramps have very similar facial features and what hair Gramps has appears to be in classic Wolverine-pointy-do.
John marries Liz. He is secretly impotent. Note that Logan constantly calls him "soft John". So Logan and Liz have an affair. Note that Liz calls Logan "Thomas" and he is much more casual with her than he is with Gramps, or John. Also note that when Logan is dead, Liz cradles his body and not John's. She holds Logan and says "Oh, Thomas...What have I done?". What has done is bear 3 of Logan's kids- Dog, DeadKid, and James. Dog resembles Logan too strongly to be passed off as John's son. He is given to Logan to raise. Dead kid is raised by Ma and John until DK's powers manifest. He claws Ma (we see the scars on her back). DK is killed, buried, and the facts about him are covered up. When James' powers manifest and Logan is killed, it's more than Liz can take. She shoots herself.
Re-Gramps
The panel in question is in issue 3. James and Rose have just been turned away by Rose’s aunt. They are heading for the mansion when Gramps spots them. He says “Shut up, girl, and listen to me. If you wish to live, you’re going to do exactly as I say”.
In that panel we see Gramps head and chest. We also see 2 hands-one left, one right. The hands appear to belong to a single owner. The right hand has 3 partially extended claws. On the previous page, James' hands are bloodstained. These hands have no visible blood. Also, James' hands are still soft and dainty at this point. At the end of the issue Smitty examines James' hands and says that they are clearly not the hands of a laborer.
The hands in front of Gramps are weathered and calloused. I say that they are Gramps’ hands. Look at the position. Gramps is showing the back of his right hand, and the claws on it, to Rose. His left hand steadies and massages his right wrist.
Both hands look too masculine to be Roses. James is using both hands to wrap a blanket around himself.
The panel is not Gramps holding James' hand and examining the claws. Considering the disgust Gramps shows for James on the next page (he calls James "thing" , keeps his distance and won't let him in the house) it's unlikely that Gramps would touch James or put his hand near James' claws.
If there not Roses clawed hands, or James’ clawed hands, they must be Gramps’ clawed hands.
Gramps having claws also explains his lack of surprise at James' claws. And why he held that no good would come out of John's mansion.