I'd appreciate if anyone can help in any of these issues with any information or insights:
1) A Hebrew biography (https://www.geni.com/documents/view?doc_id=6000000062654531821&...) by AY Bromberg gives a son of Eliyhau called 'Meir' who moved to Paris. He continues to claim that his grandson was Rabbi Dr. Adolf Guttmacher father of Manfred and Alan and that this information was give to him by Alan. A bit of a squeeze in time to fit in Manheim - recorded elsewhere as the father of Adolf - as son of Meir.
2) The same source says that Eliyahu had a brother (unnamed) who had a son 'Manley' who lived in Jarotschin.
3) Online trees give Adolf as the son of Manheim (as above) and Dorothea. They also claim Adolf was born in Jarotschin. They also say that this Manheim was a son of Eliyahu (!) and a Caroline Lauber. Eliyhau didn't have a wife Caroline Lauber as far as I know. (Bear in mind he may have had a wife Hannah, look under the profile of his wife Jette).
4) Eliyahu and his wife Theresa (Taube) had a son Meyer who married a Pauline/Phillipine/Freida (Neufeld). Can't find mention of a son Manheim.
5) There was also a Meyer Michel Guttmacher who married a Taube Grundt. (Eliayhu had a SISTER who married a Grundt). They had a son Manheim born in Borek 1820 died in Jaraczewo 1899. He married a Hanne Labrisch in Jaraczewo 1876.
6) There was also a Meyer Guttmacher who was married to Pauline Guttmacher (Guttmacher was her maiden name too) born 1843, died 1888 in Jaraczewo. Her parents were Leib Guttmacher and Lehne Pawel. Children surviving past infancy were Rosalie (b. 1875) and Helene (b. 1879).
7) Also there are records for a Marcus Guttmacher and Pauline Guttmacher. It is unclear if this Marcus is the same person as the above-mentioned Meyer. They had 2 children Lina and Bertha.
8) http://primo.nli.org.il/primo_library/libweb/action/dlDisplay.do?vi... mentions in Hebrew a descendant of Eliyahu a Mr Tovi of Tel Aviv. On Billion Graves (https://billiongraves.com/grave/%D7%99%D7%A2%D7%A7%D7%91-%D7%9E%D7%...) there is an entry of a Yaakov Meir Tov originally Gutmacher. Maybe he's a relative. Additionaly Manfred Schanfarten Guttmacher seems to buried in the vicinity! - https://billiongraves.com/social-security/MANFRED-GUTTMACHER/91573895!