Hi Fai'siotamoni, I believe the above information is incorrect. My understanding is that the Fa'amausili is from my great grandfather, Seaga Polu Fa'amausili. The Collins comes from our great great grandfather, William Collins. Mary Collins was on of William Collins and Talita Su'a's daughter. Mary (otherwise known as Mele) took the surname Collins after her father. However, it is quite possible that Seaga and Mary took the surname Collins (which is actually Mary's maiden name) whether it be due to schooling or whatever.
I am a great great grandaughter of William and Talita. Mary Lia Silaumua nee Collins was my grandmother.