I have the information you are seeking. The father of Frederick was Silas Mahannah who was born in 1787, probably Rutland cunty, Vermont.He married Jane Rouse 11 May 1806 in Huntsburgh, Vermont. Their first child, Catherine Clarissa was my 3rd great grand- mother. Your Frederick P was born in the USA probably Vermont, altho the family lived in Bedford county Quebec. He married Oliva Burah 1n about 1846.