Based on the 1851 Lonan census showing brother William with him, I would say that John's parents are John Stowell and Ann Gell who md 6 Sep 1823 Lonan.
CHILDREN:
John ch 08 FEB 1824 Lonan, Isle Of Man
Ann ch 01 OCT 1826 Lonan, Isle Of Man buried 31 Jul 1836 Lonan age 10 d/o Jno
James ch 04 JAN 1829 Lonan, Isle Of Man
William ch 12 JUN 1831 Lonan, Isle of Man
Jane ch 21 APR 1833 Lonan, Isle Of Man
Thomas ch 17 MAY 1835 Lonan, Isle Of Man
Ann ch 11 SEP 1837 Lonan, Isle Of Man
Margaret ch 15 MAR 1840 Lonan, Isle Of Man

Ann Stowell wife of John age 36 yrs buried 30 Apr 1841 Lonan

1851 Lonan
, 03-18, 060, STOWELL, John, Kiel Callin, Head, Widower, 48, Ag Lab, Lonan
, 03-18, 060, STOWELL, Ann, Kiel Callin, Daughter, , 14, , Lonan
, 03-18, 060, STOWELL, Margaret, Kiel Callin, Daughter, , 11, Scholar, Lonan

Ann Stowell d/o Jno age 15 yrs buried 14 Apr 1853 Lonan

I believe Ann Killip Stowell remarried Thomas Crellin 11 Apr 1858 Ballaugh

Ann Killip may be d/o John Killip/Ann Kneen who was ch 24 Jul 1825 Ballaugh