Close, but not exactly, maybe? I think I found an
obituary for his wife, and based on those names, I think this could be their family (Jan 12, 1971). If so, Stephen would have been born roughly mid-1969 (so about 4 years younger than Heidi?), and Bruce looks to be older than that. There is a Bruce Sims in Naples associated with other names in the family who was born in Aug 1963, which would make him about 23 at the time of Heidi's disappearance. I believe that Bruce graduated from Lely High in 1981, while Heidi graduated from Naples High. However, she was living in Lely Estates at the time of her disappearance, and they could have well known each other from church or any number of other activities.