Jake's getting back to his roots so to speak, via his Big Sis.
Maggie will be on the April 22nd episode of The PBS series “Finding Your Roots”. 
No word if she which side of the tree she is on the search for,
but it maybe more insight on the Achs, the maternal side of Maggie and Jake's heritage. 
Both of Jake's grandparents were physicians on his mom's side of the family. His maternal grandmother Ruth, who passed away before he and Maggie were born, 
was a medical researcher who discovered that the palm-print patterns found on babies born to mothers who had German measles early in their pregnancies were signs to hidden but serious health abnormalities. His grandfather Samuel Achs was a surgeon.
Also on the April 22nd episode will be Robert Downey Jr.
The show will also be available on PBS's website.