在英语中，当他的父母给他钱时，可以用以下句型来表达：

His parents give him money.
His parents provide him with money.
His parents financially support him.

这些句子的意思都是他的父母给他钱。

来源可能是他的父母为了帮助他解决一些财务上的问题，或者是他的父母想要支持他的生活或者学习。

以下是一些英文例句及其中文翻译：

His parents give him an allowance every week. (他的父母每周给他零花钱。)
His parents provided him with a loan to help him start his own business. (他的父母给他贷款帮助他开始自己的生意。)
His parents financially support him while he studies abroad. (他的父母在他出国留学期间为他提供财政支持。)