Marn Markuson and "Lisa" Jensdatter Hansen?

I am trying to find out information on the siblings and parents of Marn Andrina (Brekke) Markuson/Markusen (wife of Jens E. Markuson/Markusen). Marn Andrina ("Maria") (b. 09 August 1847 in Maridalen, Christiana, Norway; came to NY from there with her husband-to-be Jens E. Markuson/Markusen in 1870) died at home of her sister, "Mrs. Hans (Liza) Brekke". Death certificate of "Mrs. Maria Markuson" states burial place as "South Trinity", burial date March 10, 1929. Parents: Jens Brakke and Anna Marie Mortensen/Mortensdatter, who was born in Norway. I found the name Hans O. Svensingen Brekke in a GEDCOM file on RootsWeb.com. The wife of Hans O. Svensingen Brekke--Elise Agneta (Lisa) Jensdatter Hansen-might be the sister of Marn (Brekke/Brakke) Markusen. The RootWeb.com GEDCOM file information says Lisa's father was Jens Hansen and that Lisa's mother's name was Anna Marie Mortensdatter. Lisa Jensdatter Hansen's husband, Hans Brekke, died in 1921. Are Marn and "Liza" (Lisa?) sisters? Do they have other siblings? Is the father's name Jens Brakke or Jens Hansen? Does anyone have information about Jens Hansen and Anna Marie Mortensdatter, for example, about their birth or death dates and locations? Kara D. (Kosmatka) Ishii