How do we get two siblings to play cohesively and share things with each other

What i did to my girl is, i always remind her, share with her bro. Whenever i buy new thing, i will buy 2, i will ask her choose 1 first than ask her give the one she don't want to her brother. (Give her some time to accept the fact that she is longer the only child that get attention. And show her we still care about her) Sometimes, if over run, we have to stop her and naughty time and keep the toy and tell her you must share, if not both also can't play. Good is, in school, teacher ask her to share, hence she already know what is sharing like, and wont be too difficult to guide and teach her to share things with her bro. Always do things together with the big one 1st, than get the small one tgt and play tgt. Many trial and error to find which method is suitable for 2 of my kids, as some kids, dont have this problem.

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How old are they?