Margaret is Margaret Cowley m Philip Crellin probably at Patrick 18 JUL 1835 (igi has marriage under Pat and German - probably an entry in both regs but I didn't look at German post 1815) - 1841 ref is Ger.4.15.70
Phillip is prob buried German 18 Nov 1842 age 28 so phillip jnr looks like a posthumous son.