I am confused about status of genus Broghammerus. Is it considered by scientists as existing one? Does pythonidae belongs to booidae taxa or do they form separate one? Which one is closer related to pythonidae: loxocemidae, xenopeltidae?
Your question actually includes a number of questions - one of them is the status of Broghammerus. While some authors have regarded it as valid, others regard it as a synonym of Python, as you can see in an article "Best practices..." published in 2013 in Herpetological Review and that Wolfgang Wuster made available on his RG account.
Following by www.reptile-database.com, Rawlings LH et al. (2008) "Python phylogenetics..." and "Annotated checklist of the recent and extinct pythons..." by Wulf D. Schleip and Mark O’Shea I assume Genus Broghammerus at this moment as valid. Previously I read Hoser's work and that confused me a little until I read some more about it. Nonetheless, thank you for your answer.
Phylogenetically, Python reticulatus and P. timoriensis are more closely related to the Australasian pythonine radiation than to all other species of Python in Asia and Africa, which are basal pythonines (this has been agreed by nearly all studies since the 1970s; Kluge 1993 is the exception, which found similar topology but differed in placing the pythonine root within the Australian group). A separate genus name for the reticulatus group is therefore required.
The name Broghammerus is considered a nomen nudum as the non-peer-reviewed, self-published rant-sheet in which it was originated does not meet criteria for publication of nomenclature (this can be argued under ICZN rules, but I support this view). Hoser has published no valid nomenclature since at least 2000.
Reynolds et al. (2014; doi: 10.1016/j.ympev.2013.11.011) conducted a fairly comprehensive multi-gene phylogenetic analysis of basal alethinophidian ('boa-like') snakes and confirmed earlier studies indicating that Loxocemus and Xenopeltis are successive sister taxa to true pythons (i.e. Loxocemus is closest to pythons), while Calabaria, erycines, and ungaliophines are basal lineages within or close to Boidae; pythons and boas are separate groups whose ancestors diverged in the Cretaceous (as confirmed by Paleogene fossils, e.g. Titanoboa). Reynolds et al. also proposed the name Malayopython for the 'Python' reticulatus group, and this name is now generally accepted (e.g. recent review of python systematics and taxonomy by Barker et al. 2015; doi: 10.1111/zoj.12267).
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