A difficult time finding information

[Nancy Jaderen]

I am having a big problem finding the parents of Per Eriksson,born 1764,in Södertälje. The marraige records show that he came from Hall. His wife,Anna Maria Matsdotter Österberg,was born in 1763 in Södertälje. I have not been able to find them in the birth records. The daughter,Maria Sophia Österberg,was born 25-Apr.-1802 in Södertalje and married in 1835 to Johan Erik Lundqvist. With all the large estates it is very difficult to know where to search. Should I be looking in Stads or Landforsamling. At this point I am very confused.I hope someone can help
Thank you Nancy Jaderen