having girl after boy

Lejla • 28 yo mom of one, preggers with no. 2 due June 22

hey ladies. any of you have a boy as the first child and then a girl. mine will be 21 months apart. are they getting along well? and what about ib the later years. like 4-5 etc. i am worried they will have different interests or that he will be negative towards her. what are your experiences?