I don't know which beach this is or what year. Considering the cars in the background, it had to be late 1940s or possibly very early 1950s.
I can identify the child as David and the two men as Grampa Meinzen and Bill Dray. It looks like they were having fun.
I think these are really unsual photos because Grampa Meinzen is smiling. I don't remember him smiling much, and never laughing.
Don't you love Grampa's old swimsuit?!
I think some of the older cousins might remember this particular event or ones similar to it.