Hi Robert,
Can you give us a bit more to work with? What were their parents' names? About when were they born? Were they all living in Budapest? Were they married there? What resources have you checked already (so we don't duplicate your work)? Do you have a family tree on-line that we could check? What exactly are you trying to determine--are you trying to find specific relatives of your mother's family? If so, do you know her siblings' or cousins' names?
Thanks,
Judy Petersen
Fort Collins, CO, SUA