Being biracial comes with people outside of your family unit asserting that you aren't related to your family in any way. In my own personal experience, people often assume that my father is not my father because he and I are different races.
This process is a form of forceable detachment of child from parent based on race, and it can have psychological consequences.
When strangers, whose judgement we internalize, assert that you are not a family unit, over and over again, it begins to create a dissonance in your head with regards to your identity.
This forcible removal of child from parent is something that has been done on a physically violent level to People of Color throughout American history.
The difference with biracial families is that this separation typically happens on a psychological level rather than a physical one. However, sometimes that psychological warfare can involve physical separation or confrontation. For example, a Black family in North Carolina were recently accused of kidnapping a white toddler — when he was really their son. This lead to a police questioning.
Multiracial families are subject to constant public scrutiny — from laymen and authorities alike. Make no mistake, this is a direct attack on the multiracial family unit. Such force destabilizes families and creates internal frustration and anger at one's own racial makeup.
There seems to be a need to place every individual into a tightly-fitting box — a box of social norms in terms of appearance and behavior that one must adhere to. Multiracial families defy this box method of social categorization, and are therefore seen as a threat to the social order. It is beyond the comprehension of some that different kinds of people can love each other and be family to one another. People who are made uncomfortable by the existence of a breach of the standard social makeup of our communities therefore attempt to dismantle and break apart the families and place them into separate boxes, away from one another.
This is perhaps the reason why interracial marriages were illegal in the United States up until 1967, and even later in some states. The existence of the biracial identity is a threat. Not just to white communities, but to Communities of Color, too. Many Indian Instagram influencer dissuade romantic relationships outside of the South Asian community. They do this because they believe that it is erasure of People of Color. But the existence of biracial people is not erasure of anything. It is the birth of a new identity. These pleads to remove mixed race people from Spaces of Color are dangerous and threaten our existence.
There is a specific type of racism that multiracial families and children are subjected to. It begins with the dissuasion to marry, and then moves to the breaking up of the multiracial family, and then — what next? When the existence of biracial people cannot be stopped, what happens? Violence against biracial people for their mixed identities goes largely ignored.