Sorry Bonnie, can't find any likely parents for this Hugh Crawford. Do you have the names of Hugh's & Anna's children?
Found the following in the IGI as children of Hugh Crawford & Ann Paton: Helen christened 1726 in Renfrew, Ann born 1728 in Renfrew, James b. 1730 in Govan & John b. 1734 in Govan. If they followed the Scottish naming system and James was the first born son, Helen the first born daughter, Hugh's father was likely to have been James & Ann's mother was likely to have been Helen. Didn't find any likely matches though. There were hundreds of possibilities for John, James & Hugh Crawford.
Hope you have some luck. At least you are further back than I can get!