Ds1 is trying to teach ds2 to wiggle his thumbs in circles. And to use the word gingerly instead of sheepishly all the time.
dd has explained a joke to ds2 earlier and told him to take turns when speaking to her... And explained why she flaps her hands ( normal hand gestures) when she speaks.
Ds2 in return has explained how to make hyrdogen from hydrochloric acid to dd ( who's eyes glazed over.. She's 7 lol).
See they love each other really :o