Bella, Do you have some more information such as Eugene's birth date, where he died, etc.Also, what did you mean by the phrase "...they were not adopted to the family that raised them, only baptized,..."?I assume that Russell and Irene carried the Deschene surname rather than their Foster family's surname. Did Eugene, Russell and Irene die in the USA or Canada? Also there are very few Machill's in Canada, could Gertrude's surname have been McGill instead of MacHill?
I am a direct line Miville/Deschenes descendant. Any further information you can provide may be the key to solving your ancestry enigma.