这句话完整来说，应该是：不管(生活)再苦再累，他都会当家里的顶梁柱。
所以可以翻译成这样：No matter how hard the life would be, he will always be the （backbone） of the family.
其中backbone＝pillar＝mainstay。它们中的任意一个都可以。
Regardless of when he would再苦再累pillar home
Regardless of how hard and tired it is, he will be the pillar of his familay.
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