If I was starting out with older children for reading, ( which I did
) I would start LR at day 20 ( which I didn't but should have
) for the older than 3 kids, skipping the first 20 days of words that to be honest this age group don't particularly relate too as much, and getting strait into the pattern phonics. Catch the little ones up on the lessons in between family lessons if you want to.
To adapt lessons to the older kids add words like " bulldozer" to replace words like " bottle"
Also for the older kids especially the 5 year old I would add in some phonics activities into their everyday play. Something like fridge magnet letters to build words or just mentioning beginning and ending sounds in words around you. " you want to play cars? car c...a...r.."