Movies about kids and their military father who go missing. Also a return to Heidi
	
	
		Hi,
I am looking for the title of two movies probably from the 80's.  The first has to do with some military children whose fathers get captured.  I am not thinking of Iron Eagle but this has several children.  Near the beginning I remember a red convertible going into the river.  At the end after they have rescued their fathers and are on a plane (or a boat?)  they stick one of the kids up through a hatch.  He has on an American flag shirt.  
The other is a continuation of the movie Heidi.  All I can remember about this one is Heidi is older and a cave that they take refuge in during a winter storm.
I would appreciate any information, thank you.