1. Until indicates the time of change of an activity or situation.
Pattern 1: verb + until + time
They waited until six o'clock.
The boys studied until midnight.
Pattern 2: verb + until + beginning of event
They lived here until their wedding; then they left.
She was busy until her graduation.
They didn't watch the game until halftime.
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Charting your family history
This can take many years to do properly, and even then, it isnt always possible depending on your background. It would make an amazing present to a grandmother or relative when its complete. There really isnt any limit on how far back you can attempt to go.