Parents' fluency in the two languages Parents should feel comfortable in the language they speak and be able to maintain natural social interaction with their child.
(Parents' fluency in the two languages Parents; should feel; comfortable) (they; speak; ) (they; be; able to maintain natural social interaction with their child; L:the language)
Parents' fluency in the two languages Parents they they
should feel speak be
comfortable
able to maintain natural social interaction with their child L:the language