Law Offices of Caro Kinsella | Caro Kinsella, Esq.
If you are outside the U.S. for under one year then there is no automatic abondonment of the green card. When he re-enters the U.S. make sure he has proof that he was ill; thus preventing him from entering the U.S. sooner. Furthermore,he must show that his intent was always to return to the U.S. (such as mortgage, letter from employer etc.)
Answer Applies to: Florida
Nicastro Piscopo, APLC | Louis M. Piscopo
Yes he can. He may be questioned by CBP when he arrives and should be able to explain that the reason he stayed out so long was beyond his control due to illness. He should bring proof of his illness with him when he travels.
Answer Applies to: California