I don't have a precise date for this photo, but the seller believes it was in 1931 or '32, and I'd tend to agree. The caption reads, "Carole Lombard, Paramount featured player, and her brother, Stuart Peters. Stu works on the stock exchange in Los Angeles."
Stuart was the middle child in the Peters family, born in 1905, about halfway between Frederic, born in 1902, and Jane Alice. Stuart died in 1956 and, like his mother and siblings, is buried at Forest Lawn.
The photo of Carole and Stuart is being auctioned through eBay; it's 8 x 10 inches and in very good condition. Two bids have been made, topped at $12.50, and you don't have much time to join in -- bidding closes at just after 5:45 p.m. (Eastern) today. If you want to get in on it, go to http://cgi.ebay.com/Carole-Lombard-brother-ORIGINAL-early-30s-portrait_W0QQitemZ270465506194QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3ef9001b92.