The problem is favoring candidates based on non-professional features, like their families, as you admitted to doing.
Some positions require a degree of intelligence, there are many things that can demonstrate levels and types of intelligence.
Some positions demand a certain amount of physical endurance, there are many things that can indicate physical ability.
Some positions demand a level of stability and commitment to time scale, there are many different factors that can indicate that.
Some comments require a certain ability to read qualifiers and nuance in the English language, there are many that breeze right past such things and imagine things unwritten.
None are in any way indicators of professional capabilities.