Born during battle. Stannis v/s wildling and Eddard’s band v/s Kings-guard(spec.).

Mothers died giving birth.(Lyanna and Dalla).

Their wet nurses posed as the mother(Wylla and Gilly).

Ned claimed Jon as his bastard. Sam wants to claim (yet unnamed) Aemon as his bastard.

Aemon was hidden to save from Mel while Jon to save from Robert’s wrath.

Aemon is the son of a king while Jon is the son of dragon prince.

I don’t think its a coincidence that Aemon was named after a Targ. Isn’t it ironic that Jon did the same thing to Aemon that was done to him. History indeed repeats itself.