[pino83]

Yes, let's agree it all depends on the definition of a deep friendship, I'd say.

If your definition includes regularly spending time together with your friend, not as appendix to her/his family, but with activities that connect you and your friend (e.g. with activities that you had before). With your friend focus on you then, instead of constantly being involved in other things. Ideally without the constant need to plan it months in advance.

As far as I've seen it, parents are usually far away from that. In terms of possibility, and also in terms of mindset. At some point in time, they seem to completely lose the understanding of what all these words could even mean.

It might work better if you have a more abstract or otherwise different definition. Yes.