I feel the same way.
1. Patch would put me to bed - Mits job now
2. Patch would play baseball, I throw she bat back - Lucky plays fetch, gets in range then hits back.
3. Not feeling well Patch would sit on my chest so I would not get out of bed - Mits job, but Patch was 7 lb, Mits is 16.
4. Patch would sit on the arm of the chair to watch TV - Lucky is there now
5. Patch would greet at the door. both Mits and lucky are my greeters now.
6. Patch would escort me to the bathroom - Lucky's job now
7. Patch would make sure that I went to bed at 11:00 exactly - Mits has that duty now and I can't argue with his timing.
8. Patch would get mad if I went out more then once a day, again Mits has that job, but he only holds a grudge for a day or so Patch would be mad for a week.
9. Patch loved string beans - Lucky does too
10. Patch liked potato chips (plain) - Lucky loves BBQ
11. Patch hated cat treats - both Mits and Lucky are not crazy for them
12. Could melt me with one look - both Mits and Lucky have perfected the same look.

So they never leave us, they stay in our harts and we see in others thier touch.