Parents are 5'5 and 5'4 1/2, adult daughter is 5'2. 16 year old youngest daughter is 5'2 1/2. period at 15 like other daughter. How tall will she be?

Height. Most children have their height and weight measured several times in the first year or so and then at annual physical exams. That information should be documented on a height and weight program. Ask for a copy and then see how she fits with the family height. Very likely to be the same but one never knows without clear information.