It's important to allow some special individual attention to the 4 and 6 year olds while they learn to read. Make the reading time something special and they will line up for their turn.
I've been thinking about it for last 2 days
Summing up the expirience of the way my 4 y.o. read her first word in such book
http://www.umnitsa.ru/cat/knizhnaja-razminka-sinij-vypusk/ I've understood that she did that, reading with me the bedtime story for her
And the 6 year old daughter started reading books after having the special time with her mom:),that just showed her basic rules of reading! 15 minutes and the resault is a 5 year old book reader:)
Thank you!