Incomplete question. However, I answered from a general English perspective.
Answer:
<u>It refers to the inability to provide what is necessary for something or someone that we possess.</u>
Explanation:
We can see the meaning of such expression from the point of view of someone who is speaking on behave of a group stating<em>out his displeasure</em> that they're unable to provide what is necessary for their own; which can either be a person, or a property.
For example, a father and mother unable to provide enough food for their family may say in a low tone, "we can't take care of our own," referring to their children.
