There is very little cause to worry that your children will develope it later in life. On the other hand, there is a chance that a baby will be born with blisters for a short period of time. This is caused by antibodies crossing the placenta. This will resolve by itself and does not require treatment of the baby. Pemphigus tends to be a very chronic or long lasting disease but there are a wide range of useful and effective treatments.
Treatment requires the patients to take an active part in the recovery plan.
I do think people go into spontaneous remission and you be hopeful about that.