If it was Jane surely Mike would have accompied her. Mike has some children did Maureen, does, Patti or Ronald have any or is this the only Reagan grandchildren.
I'm not well versed on their families. Mike is the only one I'm aware of with children, but the others may. I believe I heard that they don't have any, but I may be wrong, so don't take my word as the last say on it.
Michael has two children - Cameron and Ashley Marie. I believe Maureen had one daughter named Rita. Neither Ron Jr. nor Patti have any children.