Does this Sound Right

My wife and I have our own auto policy through Safeco. We just moved her mother in to our house. She is currently with Allstate. Im going to write her auto, rental property, renters (my house) and umbrella policies through Safeco. However, I just got off the phone with an underwriter from Safeco and she tells me that my wife and I need to be rated or excluded from her auto policy, not just listed with own insurance EVEN though we have our policy with Safeco. When I rate us the premium jumps and screws the whole thing up. Is this right? If it is, what a crock of bs.
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