[plafl]

Not the parent but I would say you just need a little of statistics and a little of calculus and linear algebra. If you are interested in theory then you need more.

For statistics I would recommend "All of Statistics".

The level of calculus required is to know to differentiate.

Algebra is more important. Any introductory linear algebra book would do. If you are able to multiply matrices and solve equations you can postpone a topic until necessary like for example eigenvectors or matrix factorization.

My advice is to first jump into the pool and learn swimming as needed. But learn swimming, use the concrete problems to motivate yourself.