Sorry, that was a bit long-winded, but what Im trying to say is that if you do decide to add to your gorgeous brood, be guided by whatever you think will fit in best, be it an 8 week old kitten or an 18 year old cat and dont feel any guilt for the ones you leave behind. I would also suggest that if you do decide to look around you keep an open mind because sometimes the one that is right for you is not the one you thought it would be.
I agree with this quote from Carol
its about choosing what would best fit in your family and often a cat that is just a few years old (or even months old as Carol said) isnt always instantly re-homeable.
I re-homed a 2yr old to be companian for my now 10yr old after my oldest cat went to the Bridge. This went as smoothly as i could of hoped although still the odd punch on the nose is exchanged, they sleep near each other - albeit not curled up like your beauties - but given my eldests grumpiness i am pleased with that
I promised i'd always adopted older or young adults from there on in.
Then along came a space for another.....after much soul searching and humming and harring at the local rescue we adopted 16week old Evie in June. My first Tabby (Mine have either all been black or B&W - & she doesnt even match my decor like the other 2!
) because i didnt think my 10yrs old would fair well with another adult and that he may be more tolerant of a youngster. I was partly right, although she does scare the life out of him by landing on him from no where but he coped quicker. My 2yr adoptee also took to her well
Evie probably wasnt the most unadoptable kitten (but the only single kitten they had as the others - not related to her - were established pairs of a few months old) but speaking to the Rescue Manager just at the weekend they did worry about homing her suitably as being pretty, they find people want them on a whim regardless of temperment or suitability to their personal situations and they wanted to make sure she got the right home also - so were glad she came to the crazy cat lady
and not just someone who wanted pretty cats and in true honesty, what ever her colours I would have still taken her that day.
I think a home given to any rescue kitty is a potential place for another that needs help??
Liz has the right idea of possibly fostering prior to adopting and then you can see how the law of the land lies. An older cat may well fit right in and older doesnt always mean being or wanting to be alpha.
Go with instinct and spend time with them - also like Liz said, foster or get a trial?