Speech Disfluency Correction Mantra

[emailswati]

My son is 7 years old. He had his first stutter (fairly severe) at age 2.5 yrs. After use of flower essence and on its own it went away. At age 4 he had another attack of disfluency...so i had a speech therapist work with him. After few months he was fine so we stopped speech therapy. At age 6 he had again a mild attack that lasted for two months and disappeared. Everytime an attack happened I used flower essence for my son. Now again it has appeared exactly after one year in the same month as last year. It is mild but some days bordering on severe. I am trying flower essence but I want this to be permanently cured. The speech therapist says there is no physiological issue with him. His grandfather too has a mild speech issue and sometimes words not coming out of his mouth. His father has the slightest hint of speech issue (too much repetition) but almost unnoticeable. Is there a mantra I can do to help my son. Seems almost genetic, may be I need a healing mantra for ancestors???Any advice?Please help! Thank you.