“My mother had a Reform conversion undertaken to marry my father, which is mhy I had to undergo giyur.”
Forgive me, but I still don’t understand…
1) Reform conversions have no halachic bearing
2) If her maternal grandmother was proven to have been Jewish by the picture you mentioned, she’s Jewish- you’re Jewish. Period.
PBA – “you shall not oppress the stranger, for you were once strangers in the land of Egypt.”