After ITA Name issue on document

[TJ_]

Hello everyone,

i have got the ITA and now i'm completing profile for permanent residency and i just found out that

1. My grandfather's Name has different spelling on my Passport("AMARSINHBHAI") and on my father's passport it is("AMARSHIBHAI")
which one should i use now while filling up my father's full name in Family detail field?.

any help from experienced one would be appreciated.