Whether the parents of a two-child family can be "fair" is a very complicated issue. First of all, we need to be clear about the meaning of "fairness". Fairness does not mean equal treatment, but giving different attention and support in different situations to meet the needs and development of each child.

In a two-child family, parents need to face more challenges and responsibilities. They need to balance the time and energy of taking care of their two children, and at the same time, they need to handle family and work affairs well. This is a great challenge for parents, who need a high sense of responsibility and organizational ability.

However, although parents may try their best to be fair, it is still difficult to avoid some biased situations in real life. For example, parents may pay more attention to young children because they need more care and attention. Or, parents may be more inclined to support older children because they need more education and training.

Therefore, we believe that parents of two-child families can try their best to be fair, but it is difficult to do it completely in real life. This is not because parents are not diligent or responsible, but because each child's needs and development are unique and need different attention and support.

Finally, we suggest that parents should try to balance the needs and development of their two children in the process of taking care of their children and avoid bias and preference. At the same time, children should be given enough freedom and space to develop and grow independently.