Sir William SINCLAIR of Roslin
He died about 1358 in Spain,on crusade.¹ 

 Isabella of STRATHEARN

 Henry SINCLAIR Earl of Orkney
Henry was born in 1345 and his baptism took place in 1379.  He died at the age of 59 in 1404 in Orkney Islands,k in battle.¹ 

 Gregory SINCLAIR of Longformacus

 Margaret SINCLAIR
She died in 1361.²