Xavi Alonso is a young coach with good coaching experience. He is the son of a coach, and he has been coached by almost all the greatest managers: Morinho coaches him as a captain at Real Madrid, Pep Guardiola coaches him at Bayern Munich, and Anceloti also coaches him. This means he has so much experience from different coaches that it is enough for him to be a great coach in football history, and he has started his coaching journey with an impressive performance at Bayern Leverkusen this season.
I think with this performance and coaching skills he is displaying in a small team like Bayern Leverkusen, if he accepts the Real Madrid offer, he will do well more than expected because he will have all the players he needs in a team, and the fans and the atmosphere in Santiago are something that will encourage him, especially as he is also from Spain.
To be honest I never knew his father was a coach, well if your statement is right, then I now know where he got his coaching abilities from, "the apple does not fall far from it's tree they say" well Xabi Alonso might be a young coach but not all coaches that are his age grade are experienced like him, I think he deserves some accolades and I believe if he maintains the good form of his team Leverkusen for a season or more in years to come he'll get to the standard of Pep Guardiola.
However it would be nice seeing Xabi Alonso coaching a big team, but in my opinion i feel he shouldn’t be in a hurry to move yet but rather he should take his time to develop better in his current team, and try to win a trophy to achieve the UCL spot with them, then his performance in the UCL with the small team would determine if he's really ready to switch over to a bigger side.