Sarahrach I am sorry you are feeling so very confused about your treatment after losing your boys.
You probably know TTTS happens when the babies share a placenta (monochorionic). One twin usually grows abnormally big and the other suffers. Untreated both babies have a very very high morbidity rate.

If you were not monitored carefully, told you had only one placenta and how that would likely affect your sons then you may have a case to take this matter further. Ultrasounds are done regularly to rate the babies growths. Laser treatment can be done but so can other treatments. Generally these do not happen until the babies have reached "viability" at around 26 weeks.

Usually the amniotic fluid is reduced around the larger twin.

I am so sorry my love. Perhaps it was deemed that your little boys were growing with too much disparity - but you should have been fully informed, having regular ultrasound & monitored very closely. This is one of those pregnancies that is a high risk obstetricians field & requires the finest of medicine.