Hi Mummyxtwo my hubby also works nights and we have a 6mth baby boy,this is his routine,
7.30a.m 6oz bottle and bowl of cereal
9.30a.m 1 hr nap on settee (make a 'nest' of cushions and dont leave him!)
12noon 6oz bottle,dinner,pud & beaker of water
2p.m 1 hr nap on settee (again dont leave him)
3.30p.m 6 oz bottle
5.30p.m dinner
6p.m bath,story 6oz bottle
7p.m bed.
He has had this routine since about 3mth old and he sleeps straight through although i do change his nappy before i go to bed as its a long time for him.
Also he seemed to sleep better at night when he started eating proper food.We live in a bungalow also and hubby has never been woken up by little man making a noise,perhaps you could bath the 2 lo's together and put the baby to bed,read your toddler a story and then put him to bed,Hope this helps,