I attend the twos storytime with LO 2 but parents are not allowed in the room for ages 3-5 at our library. We drop LO 1 (age 4) off in the room and then we read or play with puzzles in the children's area with LO 2/3 while we wait. A lot of the younger 3 year olds don't like attending alone so they usually crash the 2 year old storytime with their parents.