how does voluntary relinquishment affect joint custody?

[txgma]

My jurisdiction is: Texas, USA

My son has joint custody of his 5 yr old daughter. He is in the middle of a custody battle with the mother. The maternal grandmother has requested an intervention. The day that the intervention was to be decided on, the mother voluntarily relinquished her rights, requesting that her custody be given to the maternal grandmother. My questions are:

Can she designate who her custody goes to?

If the judge grants the relinguishment doesn't full custody then go to my son?

Since the intervention is active, would my son then have to fight the maternal grandmother for custody?

 

[txgma]

The actual paperwork she filed was a Consent to Suit, she signed it as the managing conservator, but they have joint managing custody. How is this possible?

 

[Duranie]

Mom cannot just sign over custody to mom, not legally anyways. It does not sound like mom relinquinshed anything. You son should file for custody and try to get an emergency hearing. Mom likely cannot terminate her rights.