Who can manage a property

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My soon-to-be father-in-law owns a rental building. He is in his early 80's now and has been in the rental business for 30+ years. ( Self-managed ) We do help him often with repairs. He recently has gotten sick. Very sick, and they are still trying to figure out what is going on with him. Needless to say, he is not currently able to manage his properties.

The property is deeded to his son ( my fiancé' ) - can he act as the server of process/agent for him? I've been reading that in Wisconsin you have to have a broker license, or be employed by someone with a broker license to do so, but what about a family member who will eventually own the property? I know you do not need a license to self manage your own property.