they can help provide better lives for their parents 改为同义句they can help --------- their parent-------better lives

they can help --supply------- their parent---with----better lives。
参考：
1、provide 有两种形式provide sb with sth 或provide sth for sb
希望对你有所帮助，学习愉快！

they can help --provide------- their parent---with----better lives。
they can help --supply------- their parent---with----better lives。

they can help --provide------- their parent---with----better lives.
they can help --supply------- their parent---with----better lives.
参考：
1、provide 有两种形式provide sb with sth 或provide sth for sb
2、supply 的用法supply sb．with sth或 supply sth．to ／for sb
希望对你有所帮助,学习愉快!

supply with