First of all Welcome to Pet Talk & enjoy all the talks & pictures..
Second of all sounds like he is marking his territory = since he started after new cat arrival.. Some cats do this anyway with their age.. (Is this a older cat?) You can buy spray from your pet stores to spray on floor & walls & furniture so he wont spray due to cats dont like the smell.. Make sure your litter boxs are kept clean also.. That can cause them to do this too.. Do keep getting your baby checked by your Vet too.. Hope this helps & good luck..
Oh your babies are so adorable..
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