I like the notion of splitting the retirement accounts three ways, having the house in a trust of sorts with eldest being in charge and giving him a specified amount of time to live there, with stipulations to take in the sibs if necessary, and then when time to sell, split three ways or option to buy out siblings' shares.

M 20+ T25+
S 15.5 (BD)
BD 4/6/15
H moved out 4/24/15
D Final 12/23/16

"True love travels on a gravel road."