Born in England. Arrived in Rhode Island [date unknown] and
Born in Rhode Island.
There were four Ladds that came to America in the very early years of this country. Daniel Ladd, in 1634 to Haverhill, Massachusetts.; Joseph Ladd to Portsmouth, Rhode Island (supposed by many researchers to be the brother of Daniel); John Ladd to Virginia prior to Oct 1653 and John Ladd to Burlington, New Jersey by 1678.
It seems that Joseph Ladd, brother to Daniel, sailed on the Hercules, on or about 31 Mar 1633/34, approximately a week after Daniel sailed on the Mary & John. He was to have sailed with Daniel on the Mary & John but remained behind to look after their chattel. Little is known about Joseph Ladd between this date and 1644 when his name first appeared on a deed of John Anthony, Portsmouth, Rhode Island. (New England Historical and Genealogy Register, Vol. 9, pg. 267) [paraphrased]
The following passage is from Warren Ladd’s book, p. 288:
We think it is evident, though there is no positive proof, that this Joseph Ladd was a younger brother of Daniel Ladd, who came from London in the Mary & John in 1633. The reason for this belief is the fact that John Anthony, whose deed of land to Richard Tew in 1644 Joseph Ladd was a witness, took the oath of Supremacy and Allegiance to pass to New England in the Mary & John, Robert Sayres master, 24th of March, 1633, but “stayed over to oversee the chattle,” and came in the Hercules, John Kidder master, which sailed a week later than the Mary & John, in which Daniel Ladd came. [See New England Historical and Genealogical Register, vol. 9, page 267.] John Anthony settled at Portsmouth. Rhode Island. Joseph Ladd lived at Portsmouth. Rhode Island. The inference is that Joseph Ladd, a minor, lived in the family of John Anthony, was a relative of Mr. Anthony or his wife, and went to Portsmouth with him.
This is the extent of what I have been able to learn of Joseph Ladd and the circumstances of his immigration to America.
Joseph Ladd married Joanna (last name unknown), whose dates are listed in various genealogies as 1635-1669. The son of Joseph Ladd and Joanna is William Ladd, born 1665 in Portsmouth, Newport, Rhode Island and died 13 Aug 1729 in Little Compton, Newport, Rhode Island. On 17 Feb 1695, William married Elizabeth Tompkins, born about 1675 in Little Compton, Newport, Rhode Island and died about 1729 in Little Compton, Newport, Rhode Island.
The daughter of Elizabeth Tomkins and William Ladd is Mary Ladd, born 5 Mar 1698 in Newport, Rhode Island and died 26 Feb 1733 in Tiverton, Newport, Rhode Island. In 1720, Mary married Joseph Seabury. Joseph was born 5 Jun 1678 in Duxbury, Massachusetts and died 22 Aug 1755 in Tiverton, Newport, Rhode Island. The lineage of Joseph Seabury and Mary Ladd continues under the heading of John Seabury (1622-1649).
 Ladd, Warren, The Ladd family: a genealogical and biographical memoir of the descendants of Daniel Ladd, of Haverhill, Mass., Joseph Ladd, of Portsmouth, R.I., John Ladd, of Burlington, N.J., John Ladd, of Charles City Co., Va. (New Bedford, Massachusetts: Printed for the author by E. Anthony) 1890.
 This was Joseph’s second marriage. He previously married Phoebe Fobes (or Smith) in 1701 in Little Compton, Newport, Rhode Island.