Oh they go down about 7pm.

Is he in a bed? I've always just done bath, stories and bed. If they wake I put them back. They have a stair gate so youngest can't get out. Morgan does occassionnally if he wakes during the night so I'd just take him back to bed. Unless he's poorly then I let him stay. You may have to repeat it several times for a while until he gets the message but stay consistent and they'll learn bedtime means bedtime.