I don't think that margaret would have been a woman of low morals to marry again after the death of her husband. There were 2 choices, marry and be supported or the workhouse. She had at least 2 children by George, though the oldesr, John, would be 15 when she married John Boyes and so probably already working, James would have been 6 and there may even have been another one or two children, If George died, at a realaituvely young age, probably under 40, and matgaret was also in her 40s, she would have to get work to live but with a child that would have been tough. It makes sense she should re-marry and if she's married her late husbands boss then she has secured her furure and her children's, plus, it would be likely John Boyes was also a widower with children in need of a mother, it makes perfect sense.