ETA: Though I should add that I do remember, if my memory isn't faulty, a very similar episode earlier in the memoirs in which Wilhelmine was given charge of a different younger sibling or siblings. I will need to look that up.
I was not misremembering! This passage is from 1725, so the year Wilhelmine turned 16:
In the mean time I was at Berlin in great favour with the king: I passed every afternoon in conversation with him, and he used to sup in my room. He even shewed me some confidence, and often spoke of state affairs. To give me a still greater mark of distinction, he ordered me to hold a drawing-room like the queen. The governesses of my sisters were placed under my command, and had orders not to stir a step without my knowledge. I did not abuse the king’s favour. Young as I was, there was as much solidity in my conduct then, as there can be now ; and I might have superintended the education of my sisters: but I did myself justice, and clearly perceived that it did not become me; neither would I hold a drawing room. I contented myself with inviting a few ladies every day.
So I think it's possible we'll find Heinrich in her care in the Stratemann volume tomorrow.
Re: Oster Wilhelmine readthrough - marriage negotiations
I was not misremembering! This passage is from 1725, so the year Wilhelmine turned 16:
In the mean time I was at Berlin in great favour with the king: I passed every afternoon in conversation with him, and he used to sup in my room. He even shewed me some confidence, and often spoke of state affairs. To give me a still greater mark of distinction, he ordered me to hold a drawing-room like the queen. The governesses of my sisters were placed under my command, and had orders not to stir a step without my knowledge. I did not abuse the king’s favour. Young as I was, there was as much solidity in my conduct then, as there can be now ; and I might have superintended the education of my sisters: but I did myself justice, and clearly perceived that it did not become me; neither would I hold a drawing room. I contented myself with inviting a few ladies every day.
So I think it's possible we'll find Heinrich in her care in the Stratemann volume tomorrow.