As you are aware that ear tubes are kept to drain the middle ear fluid.
But after 1 yr. mostly the tubes get extruded by themself.
If the ears are draining then there must be perforation in ear drum or the tubes are still there.
the tubes are there or not can only be confirmed when the ears are checked by otoscope
or under microscope by ENT specialist
If the tubes are there it is time to go to your ENT specialist and get the tubes removed.
As now they (tubes) are not allowing to heal the drum.
If the tubes are not there then there must be perforation in the drum and now you need to take antibiotics and decongestant syp. or tablets and even nasal decongestants to get rid of infection and so the healing process is made faster.
one most important thing is that you must prevent water to enter your childs ear.