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Houston-based M&D Lawn Care, run by Martin and Daniel Martinez, has been donating its time and services to homeowners who have experienced financial difficulties

Videos showing the duo at work have been a hit on social media

"They are angels that were sent to help people,” homeowner Kimberly Ray tells PEOPLE

About four years ago, Houston lawn care specialists Martin Hernandez and his son Daniel went over to an elderly woman’s home to cut her overgrown lawn. After the job was finished and they told the woman the price, the two learned that she was unable to pay.

“She told us that she can't afford her medication and how she's really struggling at the moment,” Daniel, 19, tells PEOPLE. “And from there, we just told her, 'You know what? Just forget about it. We'll leave it at

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