On the contrary, I have found probate records most helpful. When land was divided among heirs, ALL the heirs (usually spouse and children and, sometimes, heirs of dead children) were listed, and usually in birth order. This is particularly helpful for pre-1850 families--i.e., before the census listed household members by name. When there were guardianship issues, again names appeared--the minor children and the guardians. Sons-in-law often signed for their wives, confirming marriage records. Too, when heirs signed off their agreement to the settlement of the estate, they told where they were at that time, often a different place from where the decedent died. The disposal of personal property, usually at a sale, can be helpful as well: Family members and near neighbors usually purchased everything from farm animals to pots and pans. One can get a sense of the family's relative worth not by the assessed value and prices paid but rather by the kind and quality of items sold. Don't by-pass this valuable resource!