My grandsons girlfriend

Hey guys so I'm 67 and my girlfriend is 19, she is actually my grandsons girlfriend so my problem is really bad. She's been cheating on my grandson with me for six months. She's a little chubby but I like em either way at my age hahahaha! I bet a lot of you men can relate, you filthy dogs! Hahahaha! Any way we fooled around one night and I got her pregnant, big oops! We're thinking about pinning this problem on my grandson, but the thing is they haven't even had sex yet, so I'm thinking maybe they should have sex and she can use that as a story to pin the pregnancy on him. Any advice?
My grandsons girlfriend
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