He will certainly pray for dear Mrs ... and her son who so tragically took his life.
When a child is old enough to declare his intention of being a Bahá'í he is also old enough to leave the church. The Guardian does not see any harm in what you did; the parents accepted that Bahá'í writings should be read at the funeral.
Please give the Guardian's loving greetings to all the Munich believers, and assure them of his prayers on their behalf. Urge them to persevere in their teaching efforts.