Who are the Bnei Ketura Today?

The following came up again as I was searching for info to send to someone of a different mindset. But seeing as it may relate to our time, now, I am reposting this.

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As a follow-up to Rabbi Winston’s explanation of Sefer Eliyahu; Pirke Moshiach (see below),

Avraham Avinu and Ketura, after Sarah Imeinu passed, produced 6 sons.

Keturah . Hebrew: קטורה, Arabic: قطورة يُقشان
Also Known As:	"Ketura", "Qətura", "Qəṭûrāh", "Qatura", "Cetura", "Princess Keturah of Suvarnadvipa ("Islands of Gold")"
Birthdate:	estimated between 1962 BCE and 1902 BCE
Birthplace:	Ur (Mesopotâmia)

Their names are:

Zimran

Jokshan

Medan

Midian

Ishbak

Shuah

Their lineage today (from Geni) is:

Zimran . Hebrew: זמרן, Arabic: زمران‌
Birthdate:	circa -1869
Birthplace:	Harran (Mesopotâmia)
Death:	circa -1769 (91-109)
Immediate Family:	Son of Patriarch Abraham and Keturah .  Father of Abihen .; Molich . and Narim .  Brother of Midian .; Jokschan .; Medan .; Ishbak . and Shuah .  Half brother of Patriarch Isaac / יצחק אבינו; Ishmael .; Kaisan; Sauraj; Umaim and 2 others

Jokschan . Hebrew: יקשן, Arabic: يُقشان
Also Known As:	"Jokshan", "יקשן", "يُقشان"
Birthdate:	-1898
Birthplace:	Harran (Mesopotâmia)
Death:
Immediate Family:	Son of Patriarch Abraham and Keturah .  Husband of Ra'wah  Brother of Midian .; Medan .; Ishbak .; Shuah .and Zimran .  Half brother of Patriarch Isaac / יצחק אבינו; Ishmael .; Kaisan; Sauraj; Umaim and 2 others

Medan . Hebrew: מדן, Arabic: مَدان
Also Known As:	"Medan", "מדן", "مَدان"
Birthdate:	circa -1896
Birthplace:	Harran, Harran, Şanlıurfa Province, Turkey
Death:
Immediate Family:	Son of Patriarch Abraham and Keturah .  Husband of N.N. Semites  Father of עֵיפָה; עֵפֶר; חֲנֹךְ; אֲבִידָע and אֶלְדָּעָה  Brother of Midian .; Jokschan .; Ishbak .; Shuah . and Zimran .  Half brother of Patriarch Isaac / יצחק אבינו; Ishmael .; Kaisan; Sauraj; Umaim and 2 others

Midian . Hebrew: מדין, Arabic: مِديان
Also Known As:	"Midian ibn Abraham", "Midian", "מדין", "مِديان"
Birthdate:	estimated between 1927 BCE and 1867 BCE
Death:	Israel
Immediate Family:	Son of Patriarch Abraham and Keturah .  Husband of Unknown Midian  Father of Ephah .; Abida .; Eldaah .; Hanoch .; Dora Sharoob and 1 other  Brother of Jokschan .; Medan .; Ishbak .; Shuah . and Zimran .  Half brother of Patriarch Isaac / יצחק אבינו; Ishmael .; Kaisan; Sauraj; Umaim and 2 others

Ishbak . Hebrew: ישבק
Also Known As:	"Syiyaq", "Jisbak", "Josabak"
Birthdate:	-1892
Birthplace:	Harran, Harran, Şanlıurfa Province, Turkey
Death:
Immediate Family:	Son of Patriarch Abraham and Keturah .  Father of Ila-Sudyumna and Ishraku  Brother of Midian .; Jokschan .; Medan .; Shuah . and Zimran .  Half brother of Patriarch Isaac / יצחק אבינו; Ishmael .; Kaisan; Sauraj; Umaim and 2 others

Shuah . Hebrew: שוח, Arabic: شوحا
Birthdate:	-1890
Birthplace:	Harran (Mesopotâmia)
Death:
Immediate Family:	Son of Patriarch Abraham and Keturah .  Father of Sabathan . and Dadan .  Brother of Midian .; Jokschan .; Medan .; Ishbak . and Zimran .  Half brother of Patriarch Isaac / יצחק אבינו; Ishmael .; Kaisan; Sauraj; Umaim and 2 others

Comment:  How could they be a half-brother to Yitzchak? They were born after Yaakov Avinu. Any suggestions?

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From Sefaria (upon search for Sefer Eliyahu, Pirke Moshiach):

There’s a dispute whether World War III will be before the revelation of the Mashiach or after [see Otzrot Acharit HaYamim (Hebrew), http://bit.ly/2zqNFjv (link to view the seifer online) 

or When Moshiach Comes: Halachic & Aggadic Perspectives (English) by Yehudah Chayoun, part 1, chapter 5, The Battle of Gog and Magog. 

See also 

The Future: Guide to Messiah by Rabbi Lawrence Hajioff, 

Preparing For Redemption by Rabbi Pinchas Winston and 

Hold On: Surviving Days Before Moshiach by Roy S Neuberger.

True, to the Chofeitz Chayim’s prediction, World War II began in 1939, exactly 25 years later!