Subject: New Onset Spraying in 13 yr old neutered Himalayan male

For the last 6 months, a female cat and her two kittens have taken
over our yard (and we've been feeding them but mostly keeping them out
of the house.)  Mr. Redford our 13 year old cream point Himalayan and
only house cat has been going bonkers over the sight, smell, and sound
of these intruders in his yard.

He totally destroyed the sofa next to the patio door by peeing in it;
however, he left our other sofa in tact.

I just had the cushions on both sofas cleaned, and while the cleaner
was delivering the cleaned cushions, the monster kittens scooted into
the living room for a couple of minutes. Within seconds Mr. Redford
had peed into the far corner of the heretofore untouched sofa.

I immediately put him outside, foam cleaned the sofa, and dried it
with a hair dryer. Then loaded the kittens in a cage into the trunk of
my car, and with Redford sitting on the back seat of the car to
witness, relocated the kittens 30 miles away.

On our return home, I groomed Redford, gave him treats and lots of
attention.   (I had covered the said sofa with plastic for good
keeping.) He slept peacefully on my bed next to me through the night.
But apparently while I was out for an hour that evening he had acted
out. This morning I found about 1/2 liter of pee on the plastic
covering the sofa in the very corner where he had peed the day before.

Now for the first time in his 13 year life, I've kept him outside all
day, not letting him in the house.  I'm devastated and he's mad as
hell!

I just sprayed the plastic cover on the sofa with a product called
"Get Off" and reluctantly let him back into the house for the night.
He is full of affection, eating/drinking well, and using his litter
box. But I don't trust him.

Help me please,  What should I do???  There must be some appropriate
treatment for this.  Should I also get rid of the female who's still
hanging around outside begging for food?  Redford's female companion
of 12 1/2 years died about 7 months ago and he has been in mourning
over that til recently.

Desperate, Nancy