Cruz family in Atoyac, Mexico

thank you so much for your help.? When I offered to do some genealogy for a friend I didn't realized it would be so complicated. I can now start with his fathers side and work
?my back.? Blas Cruz Cruz was born to Eduardo Cruz and Rosario Cruz.? That is all he knows about that side of the family.? I have felt a little guilty because it was hard to find
any information but I am sure I am looking right at his family on familysearch.org and don't even know it because we dont know enough.? His mother's side of the family is Chinese and Mexican.? Her mother's name was Martha Garcia and all the information we have is the fact that she was born in Veracruz, Mexico. Her father was Carlos Ham and emigrated from China.? I found him listed in the 1930 census but he was married to someone else.? There was only one Carlos Ham listed in Campeche, Mexoico, could this be him?? Carlos father Francisco Ham also came to Mexico.? His wife was Maria Long but not on the 1930 census.? I found her name associated with another Ham on a ships passenger list.? My friend is adamant about the fact that Carlos was an only child but I found 5 other Ham's who came out from China, could they also be related.? I would like to be able to give my friend something.? He hardly knows any thing about his family background. Where I can go back to the 1400's in Eng
land on several sides of my family.

Tracey