I was tring to add tween behavior to a family and It disappeared from the behaviour list. So after trying some things, I found that If one of the family members have tween behaviour already It doesn't allow me to add any tween to this new family. Is it a limitation or a bug? Because It doesn't make sense.
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You can make many tween with only one using tag.
So you can initiate a tween tagged as "start", another one "animation", another one "end", …
So you only need one tween on family, and remove from object.