Ok, let me know if this sounds right...
Mr. and Mrs. Lizzywiz
request the honor of your presence
at the Nuptial Mass uniting their daughter
Lizzywiz
and
FI
son of FMIL
in the Sacrament of Holy Matrimony
on Saturday, the ninth day of February
Two thousand thirteen
at one' o clock in the afternoon
at our Catholic Church
City, State
Any corrections? I feel like the flow is weird. I want to include FMIL's name so she doesn't feel left out, but since she's not hosting anything I don't think it's appropriate to put her at the top. Also, I'm not sure what the reception card should say. We're having the reception immediately after the mass at a different location.