Make your combo record source to include 2 fields, FName and FPronounciation. Set the width of the second column to be zero if you don't want to show it. On combo AfterUpdate event, make textbox control source equal combo column(1) (column count is zero based).
You appear to be using real data (the value in FName) as a primary key field, which is not advisable. If the textbox you want to populate is bound to some field, that makes little sense if that field is in a different table. It would mean that you're keeping the same data in 2 places. If it's not bound to a different table, then perhaps your form controls ought to be bound to tblFamily and you filter the form records according to the combo value chosen. In that case, you usually would not bind the combo to any field, otherwise haphazard editing of the bound field can occur. You'd just use the combo as a filtering device to only show data that's related to the chosen combo value.
If none of that helps a lot, you probably need to expound on what it is you have, are doing, and are trying to do.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.