can you go on with a child while other parent waits and then on return switch and let the child go with other parent. so child goes twice or do you go and then let spouse go while you watch kids. can it be used either way. also can bring strollers through lines for rides or do they have to left at entrance, will have 9 month old and 2 year old, bringing double stroller any thoughts on bringing double verse 2 separate.