Jealousy is not "used as a means of control" it is a feeling evoked because one feels that they do not have any control.
I agree that you shouldn't react or respond to his immature response to you talking about your cats or siblings. Have strong boundaries in place with this one or he will manipulate you through every means of passive aggression (like saying things like "maybe you should marry him then" meaning your brother for goodness sakes) he can muster. He sounds very immature.
I highly recommend that you make your wedding date far in the future until you get to know him better and see what other red flags he will fly. Yes... his immature feelings of possessiveness he is displaying because of you repeating stories about you and your brothers and pets is a red flag.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion