ulsterancestry on Family Tree Circles

Does anyone have a connection to Williams families from County Donegal Ireland

My family

Great great grandfather Lewis Williams
Great great grandmother Catherine Williams
Their children
Samuel
William
Mary Ann aged 6
Catherine Eliza aged 4

Traveled aboard the "Helen Thompson" April 1847 out of Moville Ireland to Quebec Arrived in Grosse Ile in 1847 and seem to have survived it. No mention of their deaths on route or in any Grosse Ile records.

They then disappear completely.
They left behind 2 teenage children in Donegal, one being my great grandfather who never heard from their family again

Would like to see if I can solve this mystery.

best regards
Robert Williams