My mum has taken on my female cat as she wasn't happy in my house with the young children and mum's house is quiet and calm. However she has two very docile male cats and my cat is pretty stressed with them. She has been there four full days and has the upstairs to herself while mum's cats have downstairs. They have met a couple of times and my car has hissed, mum's cats have been pretty chilled out.
Mum has a Feliway spray but I'm thinking I might buy two Feliway diffusers, one for upstairs, one for downstairs. Is that still the best brand to buy? Any other suggestions on what we could do to ease the stress in the house and get everyone chilled out with each other.