Looking for Parents OR Siblings of Adam Kelly 1814 1896 PA IA

I am trying to research the origins of my "Kelly" family name, but my search ends at Adam Kelly. I cannot find his parents.

ADAM KELLY
B: 11 OCTOBER 1814 Pennsylvania (Sewickley, Westmoreland)
M: 23 Apr 1839 United State
D: 26 JANUARY 1896 IOWA (ELVIRA CEMETERY, ELVIRA, IOWA)

Wife
ELIZABETH SAGAR
B: SEPT 1816 United States
D: 10 NOVEMBER 1888 IOWA

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There is some information that leads me to believe that his mother MAY have been Margaret Sloan, but i am not positive of this... But I cannot find record of her children's names or spouses names to be sure.

Margaret Sloan
B: about 1800 Pennsylvania, United States
D: 25 Sep 1877, Iowa, United States

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I don't know if Adam Kelly had any siblings, but if he did I may be able to use that information to help track down who his parents were.

Any information would be helpful.

Also, I have some interesting information on some of the Descendants of Adam Kelly if anyone is interested in having it...

Thanks in advance for any help!

B. Kelly