Little Jon...
We freely admit we have no knowledge of little Jon. This is not for want of trying, it's just the way it is. Maeve and Dave have tried their hardest to find him but no cigar.
Both Dave and Maeve continued to grieve for their loss of Little Jon and all their lives never gave up hope of finding him. However, they never told anyone about Jon, not even their children. Moira knew their 'secret' but it was never discussed openly, even with her.