I am sure that these are your people but not sure if they are if they are mine. In 1845 nine ships sailed from Cork Harbour with 2024 imigrants. On the passanger list for the Brunswick ship ther is a Riordan/Reardon family. The names and ages are: John 38, Catherine 36, Richard 19, Catherine 17, John 15, Michael 12, William 9, Thomas 4, and Patrick 2 months old. There are 2 of the names you listed. This is probably the whole family. Do the ages fit? They came from Charleville, Cork and settled in Asphodel township in Ontario.
Have you looked at this web site for the passanger lists? I can give it to you if you like.