First Solar: Why Sam's Daughter-in-Law Is Wealthiest Walton by Gwen Moritz Posted 7/26/2010 12:00 am Updated 6 years ago An early investment in First Solar mean John Walton's widow is wealthier than his Wal-Mart heir siblings. Want the Full Article? Get Unlimited Archive Access for $19.95 per Year Readers must pay to access articles older than 15 days. Articles newer than 15 days are not included in this offer. Purchase Now Already have archive access? Login to view this article.