Anyone knows thai law

Can anyone help me with the law? Essentially, my friend and his wife do not have a formal marriage certificate, and they are currently involved in a dispute over child custody. The situation arose when my friend discovered that his wife has a new boyfriend, a fact that she had kept a secret from him. Their child accidentally revealed this information, and now my friend is aware of the situation. It is important to note that his wife lied to him and told her new boyfriend that she and her husband are no longer together, even though their communication primarily revolves around their child. Despite the husband’s absence due to work, he consistently provides financial support by sending money for electricity bills, food, and other necessities to ensure the well-being of their child. Given the revelation of the secret, who is likely to win the custody case and be granted custody of the child?”

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